Ene-type mechanistic reactions with cyclic olefins catalyzed by Zn2Bi2-sandwich type polyoxometalate and anhydrous hydrogenperoxide

SRINIVASA RAO AMANCHI, Organic Chemistry, Weizmann institute of Science, Rehovot, Israel

Sandwich type polyoxometalates have importance in catalytic applications due to the sandwich portion that has been identified as the key site for catalysis.¹Recently there have been many developments to generate the singlet oxygen (¹O₂) by modification of a basic site of a compound.² We present here the first report on a novel external base free Q_xNa_14-x{Zn₂Bi₂[ZnW₉O₃₄]₂} (QZn₂Bi₂) sandwich polyoxometalate showing selectivity towards formation of alcohols and ketones from cyclic olefins with anhydrous hydrogen peroxide (Q⁺ = Tetrabutylammonium cation). The presence of lone pair on bismuth offers the unique basic site in the current system. The mechanism was further confirmed by the reaction with substituted cyclic olefins.

References

1. Ronny Neumann, A M. Khenkin, and Mazal Dahan, Angew chem, Int. Ed.

1994, 34, 1587.

2. Claude Schweitzer and Reinhard Schmidt, Chem. Rev. 2003, 103, 1685.dy of your abstract here


Ene-type mechanistic reactions with cyclic olefins catalyzed by Zn2Bi2-sandwich type polyoxometalate and anhydrous hydrogenperoxide SRINIVASA RAO AMANCHI, Organic Chemistry, Weizmann institute of Science, Rehovot, Israel Sandwich type polyoxometalates have importance in catalytic applications due to the sandwich portion that has been identified as the key site for catalysis.¹Recently there have been many developments to generate the singlet oxygen (¹O₂) by modification of a basic site of a compound.² We present here the first report on a novel external base free Q_xNa_14-x{Zn₂Bi₂[ZnW₉O₃₄]₂} (QZn₂Bi₂) sandwich polyoxometalate showing selectivity towards formation of alcohols and ketones from cyclic olefins with anhydrous hydrogen peroxide (Q⁺ = Tetrabutylammonium cation). The presence of lone pair on bismuth offers the unique basic site in the current system. The mechanism was further confirmed by the reaction with substituted cyclic olefins. References 1. Ronny Neumann, A M. Khenkin, and Mazal Dahan, Angew chem, Int. Ed. 1994, 34, 1587. 2. Claude Schweitzer and Reinhard Schmidt, Chem. Rev. 2003, 103, 1685.dy of your abstract here

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